--- /dev/null
+// Test that we can compile .c files as C++ and vice versa
+// RUN: llvmc -x c++ %s -x c %p/../test_data/false.cpp -x lisp -x whatnot -x none %p/../test_data/false2.cpp -o %t
+// RUN: ./%t | grep hello
+
+#include <iostream>
+
+extern "C" void test();
+extern std::string test2();
+
+int main() {
+ std::cout << "h";
+ test();
+ std::cout << test2() << '\n';
+}